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<!--$Id: lock_detect.so,v 10.26 2000/03/17 01:53:59 bostic Exp $-->
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<h1>lock_detect</h1>
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<h3><pre>
#include <db.h>
<p>
int
lock_detect(DB_ENV *env,
u_int32_t flags, u_int32_t atype, int *aborted);
</pre></h3>
<h1>Description</h1>
<p>The lock_detect function runs one iteration of the deadlock detector.
The deadlock detector traverses the lock table, and for each deadlock
it finds, marks one of the participating transactions for abort.
<p>The <b>flags</b> value must be set to 0 or by bitwise inclusively <b>OR</b>'ing together one or more
of the following values.
<p><dl compact>
<p><dt><a name="DB_LOCK_CONFLICT">DB_LOCK_CONFLICT</a><dd>Only run the deadlock detector if a lock conflict has occurred since
the last time that the deadlock detector was run.
</dl>
<p>The <b>atype</b> parameter specifies which transaction to abort in the
case of deadlock. It must be set to one of possible arguments listed for
the <a href="../api_c/env_set_lk_detect.html">DBENV->set_lk_detect</a> interface.
<p>If the <b>aborted</b> parameter is non-NULL, the memory location it
references will be set to the number of transactions aborted by the
lock_detect function.
<p>The lock_detect function is the underlying function used by the <a href="../utility/db_deadlock.html">db_deadlock</a> utility.
See the <a href="../utility/db_deadlock.html">db_deadlock</a> utility source code for an example of using lock_detect
in a IEEE/ANSI Std 1003.1 (POSIX) environment.
<p>The lock_detect function returns a non-zero error value on failure and 0 on success.
<h1>Errors</h1>
<p>The lock_detect function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the lock_detect function may fail and return
<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
in the same way.
<h1>See Also</h1>
<a href="../api_c/env_set_lk_conflicts.html">DBENV->set_lk_conflicts</a>,
<a href="../api_c/env_set_lk_detect.html">DBENV->set_lk_detect</a>,
<a href="../api_c/env_set_lk_max_locks.html">DBENV->set_lk_max_locks</a>,
<a href="../api_c/env_set_lk_max_lockers.html">DBENV->set_lk_max_lockers</a>,
<a href="../api_c/env_set_lk_max_objects.html">DBENV->set_lk_max_objects</a>,
<a href="../api_c/env_set_lk_max.html">DBENV->set_lk_max</a>,
<a href="../api_c/lock_detect.html">lock_detect</a>,
<a href="../api_c/lock_get.html">lock_get</a>,
<a href="../api_c/lock_id.html">lock_id</a>,
<a href="../api_c/lock_put.html">lock_put</a>,
<a href="../api_c/lock_stat.html">lock_stat</a>
and
<a href="../api_c/lock_vec.html">lock_vec</a>.
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